LinuxLists.cc - [PATCH] tracing: Use trace_create_file() to simplify creation of tracefs entry

2022-01-13 16:25:22

Subject: [PATCH] tracing: Use trace_create_file() to simplify creation of tracefs entry

Creating tracefs entries with tracefs_create_file() followed by pr_warn()
is tedious and repetitive, we can use trace_create_file() to simplify
this process and make the code more readable.

Signed-off-by: Yuntao Wang <[email protected]>
---
kernel/trace/ftrace.c | 17 +++++-------
kernel/trace/trace.c | 16 ++++++------
kernel/trace/trace_dynevent.c | 8 ++----
kernel/trace/trace_events.c | 37 ++++++++++-----------------
kernel/trace/trace_hwlat.c | 2 +-
kernel/trace/trace_kprobe.c | 14 +++-------
kernel/trace/trace_osnoise.c | 2 +-
kernel/trace/trace_printk.c | 2 +-
kernel/trace/trace_recursion_record.c | 7 ++---
kernel/trace/trace_stack.c | 4 +--
kernel/trace/trace_uprobe.c | 4 +--
11 files changed, 44 insertions(+), 69 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 403e485bf091..3c5e3838772d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -983,11 +983,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
}
}

- entry = tracefs_create_file("function_profile_enabled",
- TRACE_MODE_WRITE, d_tracer, NULL,
- &ftrace_profile_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
+ trace_create_file("function_profile_enabled",
+ TRACE_MODE_WRITE, d_tracer, NULL,
+ &ftrace_profile_fops);
}

#else /* CONFIG_FUNCTION_PROFILER */
@@ -6366,11 +6364,10 @@ static __init int ftrace_init_dyn_tracefs(struct dentry *d_tracer)

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
trace_create_file("set_graph_function", TRACE_MODE_WRITE, d_tracer,
- NULL,
- &ftrace_graph_fops);
+ NULL, &ftrace_graph_fops);
+
trace_create_file("set_graph_notrace", TRACE_MODE_WRITE, d_tracer,
- NULL,
- &ftrace_graph_notrace_fops);
+ NULL, &ftrace_graph_notrace_fops);
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

return 0;
@@ -7744,7 +7741,7 @@ static const struct file_operations ftrace_no_pid_fops = {
void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer)
{
trace_create_file("set_ftrace_pid", TRACE_MODE_WRITE, d_tracer,
- tr, &ftrace_pid_fops);
+ tr, &ftrace_pid_fops);
trace_create_file("set_ftrace_notrace_pid", TRACE_MODE_WRITE,
d_tracer, tr, &ftrace_no_pid_fops);
}
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a73d78dcda2c..5d66e79f43e7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9422,10 +9422,10 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
int cpu;

trace_create_file("available_tracers", TRACE_MODE_READ, d_tracer,
- tr, &show_traces_fops);
+ tr, &show_traces_fops);

trace_create_file("current_tracer", TRACE_MODE_WRITE, d_tracer,
- tr, &set_tracer_fops);
+ tr, &set_tracer_fops);

trace_create_file("tracing_cpumask", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_cpumask_fops);
@@ -9472,7 +9472,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
tr->buffer_percent = 50;

trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer,
- tr, &buffer_percent_fops);
+ tr, &buffer_percent_fops);

create_trace_options_dir(tr);

@@ -9680,19 +9680,19 @@ static __init int tracer_init_tracefs(void)
ftrace_init_tracefs_toplevel(&global_trace, NULL);

trace_create_file("tracing_thresh", TRACE_MODE_WRITE, NULL,
- &global_trace, &tracing_thresh_fops);
+ &global_trace, &tracing_thresh_fops);

trace_create_file("README", TRACE_MODE_READ, NULL,
- NULL, &tracing_readme_fops);
+ NULL, &tracing_readme_fops);

trace_create_file("saved_cmdlines", TRACE_MODE_READ, NULL,
- NULL, &tracing_saved_cmdlines_fops);
+ NULL, &tracing_saved_cmdlines_fops);

trace_create_file("saved_cmdlines_size", TRACE_MODE_WRITE, NULL,
NULL, &tracing_saved_cmdlines_size_fops);

trace_create_file("saved_tgids", TRACE_MODE_READ, NULL,
- NULL, &tracing_saved_tgids_fops);
+ NULL, &tracing_saved_tgids_fops);

trace_eval_init();

@@ -9704,7 +9704,7 @@ static __init int tracer_init_tracefs(void)

#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("dyn_ftrace_total_info", TRACE_MODE_READ, NULL,
- NULL, &tracing_dyn_info_fops);
+ NULL, &tracing_dyn_info_fops);
#endif

create_trace_instances(NULL);
diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index e34e8182ee4b..6f6ee1d9e247 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -262,12 +262,8 @@ static __init int init_dynamic_event(void)
if (ret)
return 0;

- entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
- NULL, &dynamic_events_ops);
-
- /* Event list interface */
- if (!entry)
- pr_warn("Could not create tracefs 'dynamic_events' entry\n");
+ trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
+ NULL, &dynamic_events_ops);

return 0;
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 3147614c1812..408f8a8a7723 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
struct dentry *d_events;
struct dentry *entry;

- entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
- tr, &ftrace_set_event_fops);
- if (!entry) {
- pr_warn("Could not create tracefs 'set_event' entry\n");
+ entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
+ tr, &ftrace_set_event_fops);
+ if (!entry)
return -ENOMEM;
- }

d_events = tracefs_create_dir("events", parent);
if (!d_events) {
@@ -3466,25 +3464,21 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)

/* There are not as crucial, just warn if they are not created */

- entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
- tr, &ftrace_set_event_pid_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'set_event_pid' entry\n");
+ trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
+ tr, &ftrace_set_event_pid_fops);

- entry = tracefs_create_file("set_event_notrace_pid",
- TRACE_MODE_WRITE, parent, tr,
- &ftrace_set_event_notrace_pid_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
+ trace_create_file("set_event_notrace_pid",
+ TRACE_MODE_WRITE, parent, tr,
+ &ftrace_set_event_notrace_pid_fops);

/* ring buffer internal formats */
trace_create_file("header_page", TRACE_MODE_READ, d_events,
- ring_buffer_print_page_header,
- &ftrace_show_header_fops);
+ ring_buffer_print_page_header,
+ &ftrace_show_header_fops);

trace_create_file("header_event", TRACE_MODE_READ, d_events,
- ring_buffer_print_entry_header,
- &ftrace_show_header_fops);
+ ring_buffer_print_entry_header,
+ &ftrace_show_header_fops);

tr->event_dir = d_events;

@@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
__init int event_trace_init(void)
{
struct trace_array *tr;
- struct dentry *entry;
int ret;

tr = top_trace_array();
if (!tr)
return -ENODEV;

- entry = tracefs_create_file("available_events", TRACE_MODE_READ,
- NULL, tr, &ftrace_avail_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'available_events' entry\n");
+ trace_create_file("available_events", TRACE_MODE_READ,
+ NULL, tr, &ftrace_avail_fops);

ret = early_event_add_tracer(NULL, tr);
if (ret)
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 56bb7b890578..7bab09a6bd0a 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -796,7 +796,7 @@ static int init_tracefs(void)
if (!hwlat_sample_width)
goto err;

- hwlat_thread_mode = trace_create_file("mode", TRACE_MODE_WRITE,
+ hwlat_thread_mode = tracefs_create_file("mode", TRACE_MODE_WRITE,
top_dir,
NULL,
&thread_mode_fops);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 3d85323278ed..d13826ea490b 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1912,19 +1912,13 @@ static __init int init_kprobe_trace(void)
if (ret)
return 0;

- entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
- NULL, NULL, &kprobe_events_ops);
-
/* Event list interface */
- if (!entry)
- pr_warn("Could not create tracefs 'kprobe_events' entry\n");
+ trace_create_file("kprobe_events", TRACE_MODE_WRITE,
+ NULL, NULL, &kprobe_events_ops);

/* Profile interface */
- entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
- NULL, NULL, &kprobe_profile_ops);
-
- if (!entry)
- pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
+ trace_create_file("kprobe_profile", TRACE_MODE_READ,
+ NULL, NULL, &kprobe_profile_ops);

setup_boot_kprobe_events();

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 36d9d5be08b4..d0aa23bcbf85 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -2075,7 +2075,7 @@ static int init_tracefs(void)
if (!tmp)
goto err;

- tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
+ tmp = tracefs_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
if (!tmp)
goto err;

diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index 29f6e95439b6..5422ac74537a 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -385,7 +385,7 @@ static __init int init_trace_printk_function_export(void)
return 0;

trace_create_file("printk_formats", TRACE_MODE_READ, NULL,
- NULL, &ftrace_formats_fops);
+ NULL, &ftrace_formats_fops);

return 0;
}
diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
index 4d4b78c8ca25..a520b11afb0d 100644
--- a/kernel/trace/trace_recursion_record.c
+++ b/kernel/trace/trace_recursion_record.c
@@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {

__init static int create_recursed_functions(void)
{
- struct dentry *dentry;

- dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
- NULL, NULL, &recursed_functions_fops);
- if (!dentry)
- pr_warn("WARNING: Failed to create recursed_functions\n");
+ trace_create_file("recursed_functions", TRACE_MODE_WRITE,
+ NULL, NULL, &recursed_functions_fops);
return 0;
}

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 5a48dba912ea..2337470e9ae0 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -560,10 +560,10 @@ static __init int stack_trace_init(void)
return 0;

trace_create_file("stack_max_size", TRACE_MODE_WRITE, NULL,
- &stack_trace_max_size, &stack_max_size_fops);
+ &stack_trace_max_size, &stack_max_size_fops);

trace_create_file("stack_trace", TRACE_MODE_READ, NULL,
- NULL, &stack_trace_fops);
+ NULL, &stack_trace_fops);

#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("stack_trace_filter", TRACE_MODE_WRITE, NULL,
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 08b0e8417302..58feb4ab34d1 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1652,10 +1652,10 @@ static __init int init_uprobe_trace(void)
return 0;

trace_create_file("uprobe_events", TRACE_MODE_WRITE, NULL,
- NULL, &uprobe_events_ops);
+ NULL, &uprobe_events_ops);
/* Profile interface */
trace_create_file("uprobe_profile", TRACE_MODE_READ, NULL,
- NULL, &uprobe_profile_ops);
+ NULL, &uprobe_profile_ops);
return 0;
}

--
2.34.1

2022-01-13 19:23:25

by Steven Rostedt

[permalink] [raw]

Subject: Re: [PATCH] tracing: Use trace_create_file() to simplify creation of tracefs entry

On Fri, 14 Jan 2022 00:25:13 +0800
Yuntao Wang <[email protected]> wrote:

> Creating tracefs entries with tracefs_create_file() followed by pr_warn()
> is tedious and repetitive, we can use trace_create_file() to simplify
> this process and make the code more readable.
>
> Signed-off-by: Yuntao Wang <[email protected]>
> ---
> kernel/trace/ftrace.c | 17 +++++-------
> kernel/trace/trace.c | 16 ++++++------
> kernel/trace/trace_dynevent.c | 8 ++----
> kernel/trace/trace_events.c | 37 ++++++++++-----------------
> kernel/trace/trace_hwlat.c | 2 +-
> kernel/trace/trace_kprobe.c | 14 +++-------
> kernel/trace/trace_osnoise.c | 2 +-
> kernel/trace/trace_printk.c | 2 +-
> kernel/trace/trace_recursion_record.c | 7 ++---
> kernel/trace/trace_stack.c | 4 +--
> kernel/trace/trace_uprobe.c | 4 +--
> 11 files changed, 44 insertions(+), 69 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 403e485bf091..3c5e3838772d 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -983,11 +983,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> }
> }
>
> - entry = tracefs_create_file("function_profile_enabled",
> - TRACE_MODE_WRITE, d_tracer, NULL,
> - &ftrace_profile_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
> + trace_create_file("function_profile_enabled",
> + TRACE_MODE_WRITE, d_tracer, NULL,
> + &ftrace_profile_fops);
> }
>
> #else /* CONFIG_FUNCTION_PROFILER */
> @@ -6366,11 +6364,10 @@ static __init int ftrace_init_dyn_tracefs(struct dentry *d_tracer)
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> trace_create_file("set_graph_function", TRACE_MODE_WRITE, d_tracer,
> - NULL,
> - &ftrace_graph_fops);
> + NULL, &ftrace_graph_fops);
> +
> trace_create_file("set_graph_notrace", TRACE_MODE_WRITE, d_tracer,
> - NULL,
> - &ftrace_graph_notrace_fops);
> + NULL, &ftrace_graph_notrace_fops);

What's with all the format change updates?

Could you resend with just the code changes? There's no reason to update
white space where the code isn't being touched.

Thanks,

-- Steve

> #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
>
> return 0;
> @@ -7744,7 +7741,7 @@ static const struct file_operations ftrace_no_pid_fops = {
> void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer)
> {
> trace_create_file("set_ftrace_pid", TRACE_MODE_WRITE, d_tracer,
> - tr, &ftrace_pid_fops);
> + tr, &ftrace_pid_fops);
> trace_create_file("set_ftrace_notrace_pid", TRACE_MODE_WRITE,
> d_tracer, tr, &ftrace_no_pid_fops);
> }
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index a73d78dcda2c..5d66e79f43e7 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -9422,10 +9422,10 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
> int cpu;
>
> trace_create_file("available_tracers", TRACE_MODE_READ, d_tracer,
> - tr, &show_traces_fops);
> + tr, &show_traces_fops);
>
> trace_create_file("current_tracer", TRACE_MODE_WRITE, d_tracer,
> - tr, &set_tracer_fops);
> + tr, &set_tracer_fops);
>
> trace_create_file("tracing_cpumask", TRACE_MODE_WRITE, d_tracer,
> tr, &tracing_cpumask_fops);
> @@ -9472,7 +9472,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
> tr->buffer_percent = 50;
>
> trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer,
> - tr, &buffer_percent_fops);
> + tr, &buffer_percent_fops);
>
> create_trace_options_dir(tr);
>
> @@ -9680,19 +9680,19 @@ static __init int tracer_init_tracefs(void)
> ftrace_init_tracefs_toplevel(&global_trace, NULL);
>
> trace_create_file("tracing_thresh", TRACE_MODE_WRITE, NULL,
> - &global_trace, &tracing_thresh_fops);
> + &global_trace, &tracing_thresh_fops);
>
> trace_create_file("README", TRACE_MODE_READ, NULL,
> - NULL, &tracing_readme_fops);
> + NULL, &tracing_readme_fops);
>
> trace_create_file("saved_cmdlines", TRACE_MODE_READ, NULL,
> - NULL, &tracing_saved_cmdlines_fops);
> + NULL, &tracing_saved_cmdlines_fops);
>
> trace_create_file("saved_cmdlines_size", TRACE_MODE_WRITE, NULL,
> NULL, &tracing_saved_cmdlines_size_fops);
>
> trace_create_file("saved_tgids", TRACE_MODE_READ, NULL,
> - NULL, &tracing_saved_tgids_fops);
> + NULL, &tracing_saved_tgids_fops);
>
> trace_eval_init();
>
> @@ -9704,7 +9704,7 @@ static __init int tracer_init_tracefs(void)
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> trace_create_file("dyn_ftrace_total_info", TRACE_MODE_READ, NULL,
> - NULL, &tracing_dyn_info_fops);
> + NULL, &tracing_dyn_info_fops);
> #endif
>
> create_trace_instances(NULL);
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index e34e8182ee4b..6f6ee1d9e247 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -262,12 +262,8 @@ static __init int init_dynamic_event(void)
> if (ret)
> return 0;
>
> - entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> - NULL, &dynamic_events_ops);
> -
> - /* Event list interface */
> - if (!entry)
> - pr_warn("Could not create tracefs 'dynamic_events' entry\n");
> + trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> + NULL, &dynamic_events_ops);
>
> return 0;
> }
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 3147614c1812..408f8a8a7723 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> struct dentry *d_events;
> struct dentry *entry;
>
> - entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
> - tr, &ftrace_set_event_fops);
> - if (!entry) {
> - pr_warn("Could not create tracefs 'set_event' entry\n");
> + entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
> + tr, &ftrace_set_event_fops);
> + if (!entry)
> return -ENOMEM;
> - }
>
> d_events = tracefs_create_dir("events", parent);
> if (!d_events) {
> @@ -3466,25 +3464,21 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
>
> /* There are not as crucial, just warn if they are not created */
>
> - entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> - tr, &ftrace_set_event_pid_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'set_event_pid' entry\n");
> + trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> + tr, &ftrace_set_event_pid_fops);
>
> - entry = tracefs_create_file("set_event_notrace_pid",
> - TRACE_MODE_WRITE, parent, tr,
> - &ftrace_set_event_notrace_pid_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
> + trace_create_file("set_event_notrace_pid",
> + TRACE_MODE_WRITE, parent, tr,
> + &ftrace_set_event_notrace_pid_fops);
>
> /* ring buffer internal formats */
> trace_create_file("header_page", TRACE_MODE_READ, d_events,
> - ring_buffer_print_page_header,
> - &ftrace_show_header_fops);
> + ring_buffer_print_page_header,
> + &ftrace_show_header_fops);
>
> trace_create_file("header_event", TRACE_MODE_READ, d_events,
> - ring_buffer_print_entry_header,
> - &ftrace_show_header_fops);
> + ring_buffer_print_entry_header,
> + &ftrace_show_header_fops);
>
> tr->event_dir = d_events;
>
> @@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
> __init int event_trace_init(void)
> {
> struct trace_array *tr;
> - struct dentry *entry;
> int ret;
>
> tr = top_trace_array();
> if (!tr)
> return -ENODEV;
>
> - entry = tracefs_create_file("available_events", TRACE_MODE_READ,
> - NULL, tr, &ftrace_avail_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'available_events' entry\n");
> + trace_create_file("available_events", TRACE_MODE_READ,
> + NULL, tr, &ftrace_avail_fops);
>
> ret = early_event_add_tracer(NULL, tr);
> if (ret)
> diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
> index 56bb7b890578..7bab09a6bd0a 100644
> --- a/kernel/trace/trace_hwlat.c
> +++ b/kernel/trace/trace_hwlat.c
> @@ -796,7 +796,7 @@ static int init_tracefs(void)
> if (!hwlat_sample_width)
> goto err;
>
> - hwlat_thread_mode = trace_create_file("mode", TRACE_MODE_WRITE,
> + hwlat_thread_mode = tracefs_create_file("mode", TRACE_MODE_WRITE,
> top_dir,
> NULL,
> &thread_mode_fops);
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 3d85323278ed..d13826ea490b 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1912,19 +1912,13 @@ static __init int init_kprobe_trace(void)
> if (ret)
> return 0;
>
> - entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
> - NULL, NULL, &kprobe_events_ops);
> -
> /* Event list interface */
> - if (!entry)
> - pr_warn("Could not create tracefs 'kprobe_events' entry\n");
> + trace_create_file("kprobe_events", TRACE_MODE_WRITE,
> + NULL, NULL, &kprobe_events_ops);
>
> /* Profile interface */
> - entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
> - NULL, NULL, &kprobe_profile_ops);
> -
> - if (!entry)
> - pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
> + trace_create_file("kprobe_profile", TRACE_MODE_READ,
> + NULL, NULL, &kprobe_profile_ops);
>
> setup_boot_kprobe_events();
>
> diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
> index 36d9d5be08b4..d0aa23bcbf85 100644
> --- a/kernel/trace/trace_osnoise.c
> +++ b/kernel/trace/trace_osnoise.c
> @@ -2075,7 +2075,7 @@ static int init_tracefs(void)
> if (!tmp)
> goto err;
>
> - tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
> + tmp = tracefs_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops);
> if (!tmp)
> goto err;
>
> diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
> index 29f6e95439b6..5422ac74537a 100644
> --- a/kernel/trace/trace_printk.c
> +++ b/kernel/trace/trace_printk.c
> @@ -385,7 +385,7 @@ static __init int init_trace_printk_function_export(void)
> return 0;
>
> trace_create_file("printk_formats", TRACE_MODE_READ, NULL,
> - NULL, &ftrace_formats_fops);
> + NULL, &ftrace_formats_fops);
>
> return 0;
> }
> diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
> index 4d4b78c8ca25..a520b11afb0d 100644
> --- a/kernel/trace/trace_recursion_record.c
> +++ b/kernel/trace/trace_recursion_record.c
> @@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {
>
> __init static int create_recursed_functions(void)
> {
> - struct dentry *dentry;
>
> - dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> - NULL, NULL, &recursed_functions_fops);
> - if (!dentry)
> - pr_warn("WARNING: Failed to create recursed_functions\n");
> + trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> + NULL, NULL, &recursed_functions_fops);
> return 0;
> }
>
> diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
> index 5a48dba912ea..2337470e9ae0 100644
> --- a/kernel/trace/trace_stack.c
> +++ b/kernel/trace/trace_stack.c
> @@ -560,10 +560,10 @@ static __init int stack_trace_init(void)
> return 0;
>
> trace_create_file("stack_max_size", TRACE_MODE_WRITE, NULL,
> - &stack_trace_max_size, &stack_max_size_fops);
> + &stack_trace_max_size, &stack_max_size_fops);
>
> trace_create_file("stack_trace", TRACE_MODE_READ, NULL,
> - NULL, &stack_trace_fops);
> + NULL, &stack_trace_fops);
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> trace_create_file("stack_trace_filter", TRACE_MODE_WRITE, NULL,
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 08b0e8417302..58feb4ab34d1 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -1652,10 +1652,10 @@ static __init int init_uprobe_trace(void)
> return 0;
>
> trace_create_file("uprobe_events", TRACE_MODE_WRITE, NULL,
> - NULL, &uprobe_events_ops);
> + NULL, &uprobe_events_ops);
> /* Profile interface */
> trace_create_file("uprobe_profile", TRACE_MODE_READ, NULL,
> - NULL, &uprobe_profile_ops);
> + NULL, &uprobe_profile_ops);
> return 0;
> }
>

2022-01-14 01:11:42

by Yuntao Wang

[permalink] [raw]

Subject: [PATCH v2] tracing: Use trace_create_file() to simplify creation of tracefs entries

2022-01-14 13:11:43

by Yuntao Wang

[permalink] [raw]

Subject: [PATCH v3] tracing: Use trace_create_file() to simplify creation of tracefs entries

Creating tracefs entries with tracefs_create_file() followed by pr_warn()
is tedious and repetitive, we can use trace_create_file() to simplify
this process and make the code more readable.

Signed-off-by: Yuntao Wang <[email protected]>
---
Changes since v1:
- Remove format change updates

Changes since v2:
- Remove unused variables

kernel/trace/ftrace.c | 9 +++------
kernel/trace/trace_dynevent.c | 9 ++-------
kernel/trace/trace_events.c | 29 +++++++++------------------
kernel/trace/trace_kprobe.c | 15 ++++----------
kernel/trace/trace_recursion_record.c | 7 ++-----
5 files changed, 21 insertions(+), 48 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 403e485bf091..6d9bb73d19d3 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -952,7 +952,6 @@ static struct tracer_stat function_stats __initdata = {
static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
{
struct ftrace_profile_stat *stat;
- struct dentry *entry;
char *name;
int ret;
int cpu;
@@ -983,11 +982,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
}
}

- entry = tracefs_create_file("function_profile_enabled",
- TRACE_MODE_WRITE, d_tracer, NULL,
- &ftrace_profile_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
+ trace_create_file("function_profile_enabled",
+ TRACE_MODE_WRITE, d_tracer, NULL,
+ &ftrace_profile_fops);
}

#else /* CONFIG_FUNCTION_PROFILER */
diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index e34e8182ee4b..076b447a1b88 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -255,19 +255,14 @@ static const struct file_operations dynamic_events_ops = {
/* Make a tracefs interface for controlling dynamic events */
static __init int init_dynamic_event(void)
{
- struct dentry *entry;
int ret;

ret = tracing_init_dentry();
if (ret)
return 0;

- entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
- NULL, &dynamic_events_ops);
-
- /* Event list interface */
- if (!entry)
- pr_warn("Could not create tracefs 'dynamic_events' entry\n");
+ trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
+ NULL, &dynamic_events_ops);

return 0;
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 3147614c1812..718518b3c491 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
struct dentry *d_events;
struct dentry *entry;

- entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
- tr, &ftrace_set_event_fops);
- if (!entry) {
- pr_warn("Could not create tracefs 'set_event' entry\n");
+ entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
+ tr, &ftrace_set_event_fops);
+ if (!entry)
return -ENOMEM;
- }

d_events = tracefs_create_dir("events", parent);
if (!d_events) {
@@ -3466,16 +3464,12 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)

/* There are not as crucial, just warn if they are not created */

- entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
- tr, &ftrace_set_event_pid_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'set_event_pid' entry\n");
+ trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
+ tr, &ftrace_set_event_pid_fops);

- entry = tracefs_create_file("set_event_notrace_pid",
- TRACE_MODE_WRITE, parent, tr,
- &ftrace_set_event_notrace_pid_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
+ trace_create_file("set_event_notrace_pid",
+ TRACE_MODE_WRITE, parent, tr,
+ &ftrace_set_event_notrace_pid_fops);

/* ring buffer internal formats */
trace_create_file("header_page", TRACE_MODE_READ, d_events,
@@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
__init int event_trace_init(void)
{
struct trace_array *tr;
- struct dentry *entry;
int ret;

tr = top_trace_array();
if (!tr)
return -ENODEV;

- entry = tracefs_create_file("available_events", TRACE_MODE_READ,
- NULL, tr, &ftrace_avail_fops);
- if (!entry)
- pr_warn("Could not create tracefs 'available_events' entry\n");
+ trace_create_file("available_events", TRACE_MODE_READ,
+ NULL, tr, &ftrace_avail_fops);

ret = early_event_add_tracer(NULL, tr);
if (ret)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 3d85323278ed..5c35c2311690 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1906,25 +1906,18 @@ core_initcall(init_kprobe_trace_early);
static __init int init_kprobe_trace(void)
{
int ret;
- struct dentry *entry;

ret = tracing_init_dentry();
if (ret)
return 0;

- entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
- NULL, NULL, &kprobe_events_ops);
-
/* Event list interface */
- if (!entry)
- pr_warn("Could not create tracefs 'kprobe_events' entry\n");
+ trace_create_file("kprobe_events", TRACE_MODE_WRITE,
+ NULL, NULL, &kprobe_events_ops);

/* Profile interface */
- entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
- NULL, NULL, &kprobe_profile_ops);
-
- if (!entry)
- pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
+ trace_create_file("kprobe_profile", TRACE_MODE_READ,
+ NULL, NULL, &kprobe_profile_ops);

setup_boot_kprobe_events();

diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
index 4d4b78c8ca25..a520b11afb0d 100644
--- a/kernel/trace/trace_recursion_record.c
+++ b/kernel/trace/trace_recursion_record.c
@@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {

__init static int create_recursed_functions(void)
{
- struct dentry *dentry;

- dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
- NULL, NULL, &recursed_functions_fops);
- if (!dentry)
- pr_warn("WARNING: Failed to create recursed_functions\n");
+ trace_create_file("recursed_functions", TRACE_MODE_WRITE,
+ NULL, NULL, &recursed_functions_fops);
return 0;
}

--
2.34.1

2022-05-25 08:36:54

by Steven Rostedt

[permalink] [raw]

Subject: Re: [PATCH v3] tracing: Use trace_create_file() to simplify creation of tracefs entries

On Fri, 14 Jan 2022 21:10:52 +0800
Yuntao Wang <[email protected]> wrote:

> Creating tracefs entries with tracefs_create_file() followed by pr_warn()
> is tedious and repetitive, we can use trace_create_file() to simplify
> this process and make the code more readable.

Sorry I missed this patch (I was in the process of changing jobs when it
was sent out, and I had COVID :-p ). I'll add it to my queue.

Masami, this touches trace_kprobes.c, care to ACK that part?

Thanks,

-- Steve

>
> Signed-off-by: Yuntao Wang <[email protected]>
> ---
> Changes since v1:
> - Remove format change updates
>
> Changes since v2:
> - Remove unused variables
>
> kernel/trace/ftrace.c | 9 +++------
> kernel/trace/trace_dynevent.c | 9 ++-------
> kernel/trace/trace_events.c | 29 +++++++++------------------
> kernel/trace/trace_kprobe.c | 15 ++++----------
> kernel/trace/trace_recursion_record.c | 7 ++-----
> 5 files changed, 21 insertions(+), 48 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 403e485bf091..6d9bb73d19d3 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -952,7 +952,6 @@ static struct tracer_stat function_stats __initdata = {
> static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> {
> struct ftrace_profile_stat *stat;
> - struct dentry *entry;
> char *name;
> int ret;
> int cpu;
> @@ -983,11 +982,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> }
> }
>
> - entry = tracefs_create_file("function_profile_enabled",
> - TRACE_MODE_WRITE, d_tracer, NULL,
> - &ftrace_profile_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
> + trace_create_file("function_profile_enabled",
> + TRACE_MODE_WRITE, d_tracer, NULL,
> + &ftrace_profile_fops);
> }
>
> #else /* CONFIG_FUNCTION_PROFILER */
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index e34e8182ee4b..076b447a1b88 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -255,19 +255,14 @@ static const struct file_operations dynamic_events_ops = {
> /* Make a tracefs interface for controlling dynamic events */
> static __init int init_dynamic_event(void)
> {
> - struct dentry *entry;
> int ret;
>
> ret = tracing_init_dentry();
> if (ret)
> return 0;
>
> - entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> - NULL, &dynamic_events_ops);
> -
> - /* Event list interface */
> - if (!entry)
> - pr_warn("Could not create tracefs 'dynamic_events' entry\n");
> + trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> + NULL, &dynamic_events_ops);
>
> return 0;
> }
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 3147614c1812..718518b3c491 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> struct dentry *d_events;
> struct dentry *entry;
>
> - entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
> - tr, &ftrace_set_event_fops);
> - if (!entry) {
> - pr_warn("Could not create tracefs 'set_event' entry\n");
> + entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
> + tr, &ftrace_set_event_fops);
> + if (!entry)
> return -ENOMEM;
> - }
>
> d_events = tracefs_create_dir("events", parent);
> if (!d_events) {
> @@ -3466,16 +3464,12 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
>
> /* There are not as crucial, just warn if they are not created */
>
> - entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> - tr, &ftrace_set_event_pid_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'set_event_pid' entry\n");
> + trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> + tr, &ftrace_set_event_pid_fops);
>
> - entry = tracefs_create_file("set_event_notrace_pid",
> - TRACE_MODE_WRITE, parent, tr,
> - &ftrace_set_event_notrace_pid_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
> + trace_create_file("set_event_notrace_pid",
> + TRACE_MODE_WRITE, parent, tr,
> + &ftrace_set_event_notrace_pid_fops);
>
> /* ring buffer internal formats */
> trace_create_file("header_page", TRACE_MODE_READ, d_events,
> @@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
> __init int event_trace_init(void)
> {
> struct trace_array *tr;
> - struct dentry *entry;
> int ret;
>
> tr = top_trace_array();
> if (!tr)
> return -ENODEV;
>
> - entry = tracefs_create_file("available_events", TRACE_MODE_READ,
> - NULL, tr, &ftrace_avail_fops);
> - if (!entry)
> - pr_warn("Could not create tracefs 'available_events' entry\n");
> + trace_create_file("available_events", TRACE_MODE_READ,
> + NULL, tr, &ftrace_avail_fops);
>
> ret = early_event_add_tracer(NULL, tr);
> if (ret)
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 3d85323278ed..5c35c2311690 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1906,25 +1906,18 @@ core_initcall(init_kprobe_trace_early);
> static __init int init_kprobe_trace(void)
> {
> int ret;
> - struct dentry *entry;
>
> ret = tracing_init_dentry();
> if (ret)
> return 0;
>
> - entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
> - NULL, NULL, &kprobe_events_ops);
> -
> /* Event list interface */
> - if (!entry)
> - pr_warn("Could not create tracefs 'kprobe_events' entry\n");
> + trace_create_file("kprobe_events", TRACE_MODE_WRITE,
> + NULL, NULL, &kprobe_events_ops);
>
> /* Profile interface */
> - entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
> - NULL, NULL, &kprobe_profile_ops);
> -
> - if (!entry)
> - pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
> + trace_create_file("kprobe_profile", TRACE_MODE_READ,
> + NULL, NULL, &kprobe_profile_ops);
>
> setup_boot_kprobe_events();
>
> diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
> index 4d4b78c8ca25..a520b11afb0d 100644
> --- a/kernel/trace/trace_recursion_record.c
> +++ b/kernel/trace/trace_recursion_record.c
> @@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {
>
> __init static int create_recursed_functions(void)
> {
> - struct dentry *dentry;
>
> - dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> - NULL, NULL, &recursed_functions_fops);
> - if (!dentry)
> - pr_warn("WARNING: Failed to create recursed_functions\n");
> + trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> + NULL, NULL, &recursed_functions_fops);
> return 0;
> }
>

2022-05-27 04:18:32

by Masami Hiramatsu

[permalink] [raw]

Subject: Re: [PATCH v3] tracing: Use trace_create_file() to simplify creation of tracefs entries

On Tue, 24 May 2022 12:07:13 -0400
Steven Rostedt <[email protected]> wrote:

> On Fri, 14 Jan 2022 21:10:52 +0800
> Yuntao Wang <[email protected]> wrote:
>
> > Creating tracefs entries with tracefs_create_file() followed by pr_warn()
> > is tedious and repetitive, we can use trace_create_file() to simplify
> > this process and make the code more readable.
>
> Sorry I missed this patch (I was in the process of changing jobs when it
> was sent out, and I had COVID :-p ). I'll add it to my queue.
>
> Masami, this touches trace_kprobes.c, care to ACK that part?

Yes, trace_kprobes.c part looks good to me.

Acked-by: Masami Hiramatsu (Google) <[email protected]>

Thank you!

>
> Thanks,
>
> -- Steve
>
>
> >
> > Signed-off-by: Yuntao Wang <[email protected]>
> > ---
> > Changes since v1:
> > - Remove format change updates
> >
> > Changes since v2:
> > - Remove unused variables
> >
> > kernel/trace/ftrace.c | 9 +++------
> > kernel/trace/trace_dynevent.c | 9 ++-------
> > kernel/trace/trace_events.c | 29 +++++++++------------------
> > kernel/trace/trace_kprobe.c | 15 ++++----------
> > kernel/trace/trace_recursion_record.c | 7 ++-----
> > 5 files changed, 21 insertions(+), 48 deletions(-)
> >
> > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> > index 403e485bf091..6d9bb73d19d3 100644
> > --- a/kernel/trace/ftrace.c
> > +++ b/kernel/trace/ftrace.c
> > @@ -952,7 +952,6 @@ static struct tracer_stat function_stats __initdata = {
> > static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> > {
> > struct ftrace_profile_stat *stat;
> > - struct dentry *entry;
> > char *name;
> > int ret;
> > int cpu;
> > @@ -983,11 +982,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> > }
> > }
> >
> > - entry = tracefs_create_file("function_profile_enabled",
> > - TRACE_MODE_WRITE, d_tracer, NULL,
> > - &ftrace_profile_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'function_profile_enabled' entry\n");
> > + trace_create_file("function_profile_enabled",
> > + TRACE_MODE_WRITE, d_tracer, NULL,
> > + &ftrace_profile_fops);
> > }
> >
> > #else /* CONFIG_FUNCTION_PROFILER */
> > diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> > index e34e8182ee4b..076b447a1b88 100644
> > --- a/kernel/trace/trace_dynevent.c
> > +++ b/kernel/trace/trace_dynevent.c
> > @@ -255,19 +255,14 @@ static const struct file_operations dynamic_events_ops = {
> > /* Make a tracefs interface for controlling dynamic events */
> > static __init int init_dynamic_event(void)
> > {
> > - struct dentry *entry;
> > int ret;
> >
> > ret = tracing_init_dentry();
> > if (ret)
> > return 0;
> >
> > - entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> > - NULL, &dynamic_events_ops);
> > -
> > - /* Event list interface */
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'dynamic_events' entry\n");
> > + trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL,
> > + NULL, &dynamic_events_ops);
> >
> > return 0;
> > }
> > diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> > index 3147614c1812..718518b3c491 100644
> > --- a/kernel/trace/trace_events.c
> > +++ b/kernel/trace/trace_events.c
> > @@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> > struct dentry *d_events;
> > struct dentry *entry;
> >
> > - entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent,
> > - tr, &ftrace_set_event_fops);
> > - if (!entry) {
> > - pr_warn("Could not create tracefs 'set_event' entry\n");
> > + entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent,
> > + tr, &ftrace_set_event_fops);
> > + if (!entry)
> > return -ENOMEM;
> > - }
> >
> > d_events = tracefs_create_dir("events", parent);
> > if (!d_events) {
> > @@ -3466,16 +3464,12 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
> >
> > /* There are not as crucial, just warn if they are not created */
> >
> > - entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> > - tr, &ftrace_set_event_pid_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'set_event_pid' entry\n");
> > + trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent,
> > + tr, &ftrace_set_event_pid_fops);
> >
> > - entry = tracefs_create_file("set_event_notrace_pid",
> > - TRACE_MODE_WRITE, parent, tr,
> > - &ftrace_set_event_notrace_pid_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n");
> > + trace_create_file("set_event_notrace_pid",
> > + TRACE_MODE_WRITE, parent, tr,
> > + &ftrace_set_event_notrace_pid_fops);
> >
> > /* ring buffer internal formats */
> > trace_create_file("header_page", TRACE_MODE_READ, d_events,
> > @@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void)
> > __init int event_trace_init(void)
> > {
> > struct trace_array *tr;
> > - struct dentry *entry;
> > int ret;
> >
> > tr = top_trace_array();
> > if (!tr)
> > return -ENODEV;
> >
> > - entry = tracefs_create_file("available_events", TRACE_MODE_READ,
> > - NULL, tr, &ftrace_avail_fops);
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'available_events' entry\n");
> > + trace_create_file("available_events", TRACE_MODE_READ,
> > + NULL, tr, &ftrace_avail_fops);
> >
> > ret = early_event_add_tracer(NULL, tr);
> > if (ret)
> > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> > index 3d85323278ed..5c35c2311690 100644
> > --- a/kernel/trace/trace_kprobe.c
> > +++ b/kernel/trace/trace_kprobe.c
> > @@ -1906,25 +1906,18 @@ core_initcall(init_kprobe_trace_early);
> > static __init int init_kprobe_trace(void)
> > {
> > int ret;
> > - struct dentry *entry;
> >
> > ret = tracing_init_dentry();
> > if (ret)
> > return 0;
> >
> > - entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE,
> > - NULL, NULL, &kprobe_events_ops);
> > -
> > /* Event list interface */
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'kprobe_events' entry\n");
> > + trace_create_file("kprobe_events", TRACE_MODE_WRITE,
> > + NULL, NULL, &kprobe_events_ops);
> >
> > /* Profile interface */
> > - entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ,
> > - NULL, NULL, &kprobe_profile_ops);
> > -
> > - if (!entry)
> > - pr_warn("Could not create tracefs 'kprobe_profile' entry\n");
> > + trace_create_file("kprobe_profile", TRACE_MODE_READ,
> > + NULL, NULL, &kprobe_profile_ops);
> >
> > setup_boot_kprobe_events();
> >
> > diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c
> > index 4d4b78c8ca25..a520b11afb0d 100644
> > --- a/kernel/trace/trace_recursion_record.c
> > +++ b/kernel/trace/trace_recursion_record.c
> > @@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = {
> >
> > __init static int create_recursed_functions(void)
> > {
> > - struct dentry *dentry;
> >
> > - dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> > - NULL, NULL, &recursed_functions_fops);
> > - if (!dentry)
> > - pr_warn("WARNING: Failed to create recursed_functions\n");
> > + trace_create_file("recursed_functions", TRACE_MODE_WRITE,
> > + NULL, NULL, &recursed_functions_fops);
> > return 0;
> > }
> >
>

--
Masami Hiramatsu (Google) <[email protected]>